IT1031405B - Lettore ottico - Google Patents

Lettore ottico

Info

Publication number
IT1031405B
IT1031405B IT19886/75A IT1988675A IT1031405B IT 1031405 B IT1031405 B IT 1031405B IT 19886/75 A IT19886/75 A IT 19886/75A IT 1988675 A IT1988675 A IT 1988675A IT 1031405 B IT1031405 B IT 1031405B
Authority
IT
Italy
Prior art keywords
optical reader
reader
optical
Prior art date
Application number
IT19886/75A
Other languages
English (en)
Original Assignee
Thomson Brandt
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thomson Brandt filed Critical Thomson Brandt
Application granted granted Critical
Publication of IT1031405B publication Critical patent/IT1031405B/it

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
    • G11B7/08505—Methods for track change, selection or preliminary positioning by moving the head
    • G11B7/08511—Methods for track change, selection or preliminary positioning by moving the head with focus pull-in only
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
    • G11B7/0857—Arrangements for mechanically moving the whole head
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only
    • G11B7/0917—Focus-error methods other than those covered by G11B7/0909 - G11B7/0916
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only
    • G11B7/0916—Foucault or knife-edge methods
IT19886/75A 1974-02-04 1975-02-03 Lettore ottico IT1031405B (it)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/439,657 US3932700A (en) 1974-02-04 1974-02-04 Focus tracking registration for optical reproducing systems

Publications (1)

Publication Number Publication Date
IT1031405B true IT1031405B (it) 1979-04-30

Family

ID=23745602

Family Applications (1)

Application Number Title Priority Date Filing Date
IT19886/75A IT1031405B (it) 1974-02-04 1975-02-03 Lettore ottico

Country Status (5)

Country Link
US (1) US3932700A (it)
DE (1) DE2504570C2 (it)
FR (1) FR2260162B1 (it)
GB (1) GB1503162A (it)
IT (1) IT1031405B (it)

Families Citing this family (63)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4165519A (en) * 1973-07-31 1979-08-21 Mansei Kogyo Kabushiki Kaisha Optical control system for read out from information recording medium
US4038679A (en) * 1974-02-14 1977-07-26 U.S. Philips Corporation Apparatus for reading an optically recorded record carrier provided with periodic surface undulations and for deriving a focussing control signal from such surface undulations
FR2280150B1 (fr) * 1974-07-26 1977-01-07 Thomson Brandt Dispositif de detection d'ecart de mise au point d'une tete de lecture optique par rapport a une surface de lecture
FR2306495A1 (fr) * 1975-04-04 1976-10-29 Thomson Brandt Systeme de lecture d'un enregistrement par exploration optique ponctuelle d'une piste diffractante
JPS5855567B2 (ja) * 1975-06-06 1983-12-10 株式会社日立製作所 ジヨウホウサイセイホウシキ
FR2326006A1 (fr) * 1975-09-26 1977-04-22 Thomson Brandt Procede de commande de la mise en route et de l'arret de la lecture d'un support d'enregistrement, support d'enregistrement et appareil pour la mise en oeuvre de ce procede
DE2661053C2 (it) * 1975-10-08 1988-05-26 Olympus Optical Co., Ltd., Tokio/Tokyo, Jp
FR2330062A1 (fr) * 1975-10-31 1977-05-27 Thomson Brandt Dispositif de recherche de focalisation et lecteur optique comportant un tel dispositif
US4110607A (en) * 1975-12-22 1978-08-29 Victor Company Of Japan, Ltd. System for detecting height fluctuations of a surface on a recording medium in an optical recording or reproducing apparatus
NL178915C (nl) * 1976-01-16 1986-06-02 Philips Nv Automatisch optisch focusseersysteem.
NL7600479A (nl) * 1976-01-19 1977-07-21 Philips Nv Automatisch optisch focusseersysteem.
NL7600843A (nl) * 1976-01-28 1977-08-01 Philips Nv Inrichting voor het uitlezen van een registratie- drager waarop informatie, bijvoorbeeld en/of ge- luidsinformatie, is aangebracht.
GB1576426A (en) * 1976-03-19 1980-10-08 Rca Corp Eccentricity compensating system in recording and playbackapparatus
NL176315C (nl) * 1976-05-12 1985-03-18 Philips Nv Optische aftastinrichting.
NL7608561A (nl) * 1976-08-02 1978-02-06 Philips Nv Optische uitleeseenheid voor het aftasten van een registratiedrager voorzien van een stra- lingsreflekterende informatiestruktuur.
JPS54102107A (en) * 1978-01-30 1979-08-11 Hitachi Ltd Control information detecting method
JPS54124705A (en) * 1978-03-20 1979-09-27 Teac Corp Optical reproducer
US4439848A (en) * 1978-03-27 1984-03-27 Discovision Associates Focusing system for video disc player
FR2425782B1 (fr) * 1978-05-10 1988-02-12 Olympus Optical Co Appareil de lecture d'informations optiques
JPS583297B2 (ja) * 1978-06-09 1983-01-20 株式会社日立製作所 情報記録再生方法，その装置およびその記録媒体
US4243850A (en) * 1979-02-07 1981-01-06 Eastman Kodak Company Apparatus for tracking a record track on a video disc
US4445209A (en) * 1979-08-27 1984-04-24 Discovision Associates Dithered focusing systems
US4322837A (en) * 1979-08-27 1982-03-30 Discovision Associates Dithered center tracking system
DE3042676A1 (de) * 1979-11-12 1981-05-21 Mansei Kogyo K.K., Kawaguchi, Saitama Abtastvorrichtung zur verwendung in einem geraet zum lesen von video- und/oder tonfrequenzinformation
JPS5694528A (en) * 1979-12-28 1981-07-31 Matsushita Electric Ind Co Ltd Drawing-in method of focus servo
US4504934A (en) * 1980-05-02 1985-03-12 Matsushita Electric Industrial Co., Ltd. Optical signal reproducing apparatus
US4383168A (en) * 1980-06-02 1983-05-10 Raytheon Company Automatic focusing apparatus
US4501962A (en) * 1980-06-02 1985-02-26 Raytheon Company Method of focusing optical apparatus
JPS5720928A (en) * 1980-07-09 1982-02-03 Toshiba Corp Optical disk reproduction system
US4358774A (en) * 1980-07-14 1982-11-09 Discovision Associates Apparatus and method for controlling focus in a recording system
US4357533A (en) * 1980-07-14 1982-11-02 Discovision Associates Focus detector for an optical disc playback system
NL8004969A (nl) * 1980-09-02 1982-04-01 Philips Nv Inrichting voor optische scherpstelling.
US4484319A (en) * 1980-09-19 1984-11-20 Matsushita Electric Industrial Co., Ltd. Apparatus for locating a track on disc-like optical information carriers
US4291958A (en) * 1980-10-03 1981-09-29 Eastman Kodak Company Camera with electronic flash and piezoelectric lens motor
US4385373A (en) * 1980-11-10 1983-05-24 Eastman Kodak Company Device for focus and alignment control in optical recording and/or playback apparatus
JPS57120238A (en) * 1981-01-16 1982-07-27 Matsushita Electric Ind Co Ltd Reproducing device
US4530080A (en) * 1981-04-07 1985-07-16 Tdk Electronics Co., Ltd. Optical recording/reproducing system
JPS57181431A (en) * 1981-04-10 1982-11-08 Olympus Optical Co Ltd Automatic tracking system for optical type disc
JPS5812143A (ja) * 1981-07-13 1983-01-24 Canon Inc 光学的情報の入出力装置
JPS5848033U (ja) * 1981-09-22 1983-03-31 萬世工業株式会社 レンズ駆動装置
NL8105346A (it) * 1981-11-26 1983-06-16
NL8105347A (nl) * 1981-11-26 1983-06-16 Philips Nv Inrichting voor het optisch aftasten van een schijfvormige registratiedrager.
JPS5897730U (ja) * 1981-12-24 1983-07-02 ヤマハ株式会社 光学式情報記録再生装置における自動焦点装置
US4446546A (en) * 1981-12-31 1984-05-01 Magnetic Peripherals Inc. Focus initialization system for optical recording
JPS58155527A (ja) * 1982-03-10 1983-09-16 Hitachi Ltd 光デイスクプレ−ヤのフオ−カス引き込み回路
EP0095852A1 (en) * 1982-05-19 1983-12-07 BURROUGHS CORPORATION (a Michigan corporation) Focusing control circuitry for an optical memory system
DE3368794D1 (en) * 1982-05-19 1987-02-05 Burroughs Corp Optical memory system having improved positioning and focusing control circuitry
US4674076A (en) * 1982-05-19 1987-06-16 Burroughs Corporation Optical memory system having improved positioning and focusing control circuitry
US4669074A (en) * 1982-05-19 1987-05-26 Burroughs Corporation Focusing control circuitry for an optical memory system
JPS5928828U (ja) * 1982-08-17 1984-02-22 パイオニア株式会社 情報検出用スポツト光の集束位置移動制御装置
DE3346552A1 (de) * 1982-12-23 1984-06-28 Konishiroku Photo Industry Co., Ltd., Tokio/Tokyo Kamera
US4696566A (en) * 1984-02-08 1987-09-29 Sharp Kabushiki Kaisha Three-dimensional driving arrangement
JPS6124820U (ja) * 1984-07-13 1986-02-14 パイオニア株式会社 レンズ駆動装置
US4797545A (en) * 1985-09-10 1989-01-10 Mitsubishi Denki Kabushiki Kaisha Optical head device having positionally adjustable parts
JPH064414Y2 (ja) * 1986-03-10 1994-02-02 パイオニア株式会社 トラツキング制御装置
GB2233107B (en) * 1989-06-07 1993-09-01 Unisys Corp Lens shuttle mechanism for microfilmer camera
JPH03100931A (ja) * 1989-09-14 1991-04-25 Mitsubishi Electric Corp 光学式情報記録再生装置
US5268564A (en) 1990-08-03 1993-12-07 Symbol Technologies, Inc. Bar code scanner actuated by detection of scanner motion
US5663554A (en) * 1995-01-17 1997-09-02 Agfa Division, Bayer Corporation Weak lens focus adjusting mechanism based upon thickness of scanned material and imagesetter using same
US5978329A (en) * 1995-06-07 1999-11-02 Discovision Associates Technique for closed loop servo operation in optical disc tracking control
DE19537406A1 (de) * 1995-10-09 1997-04-10 Leybold Ag Vorrichtung zum Belichten eines kreisscheibenförmigen Substrates
ATE201277T1 (de) * 1995-12-06 2001-06-15 Discovision Ass Gerät und verfahren zum regeln der fokussierung
US5689485A (en) 1996-04-01 1997-11-18 Discovision Associates Tracking control apparatus and method

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3198880A (en) * 1952-09-03 1965-08-03 Hall William D Photographic disc reproduction of television signals
US3553455A (en) * 1968-03-01 1971-01-05 Copal Co Ltd Automatic focusing apparatus by means of phase discrimination
US3610934A (en) * 1969-08-22 1971-10-05 Century Geophysical Corp Automatic focusing system utilizing means for alternately directing light over two paths having slightly different lengths
US3673412A (en) * 1970-03-02 1972-06-27 Trw Inc Radiant energy beam scanning method and apparatus
US3757125A (en) * 1970-12-26 1973-09-04 Mitsubishi Electric Corp Optical tracking apparatus
US3715524A (en) * 1972-04-20 1973-02-06 Zenith Radio Corp Electro-optical groove tracking apparatus for video reproducing system
US3848095A (en) * 1972-12-20 1974-11-12 I O Metrics Corp Three dimensional electro-optical retrieval system

Also Published As

Publication number Publication date
US3932700A (en) 1976-01-13
DE2504570C2 (de) 1983-03-24
FR2260162B1 (it) 1979-02-16
FR2260162A1 (it) 1975-08-29
DE2504570A1 (de) 1975-08-28
GB1503162A (en) 1978-03-08

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Legal Events

Date Code Title Description
TA Fee payment date (situation as of event date), data collected since 19931001

Effective date: 19940131